code: def test_imbalance():
      X, y = make_multiplexer_dataset(
          address_bits=2, sample_size=1000, positive_class_ratio=0.3
      )
      np.bincount(y) == (700, 300), np.bincount(y)
  
      X, y = make_multiplexer_dataset(
          address_bits=2, sample_size=1000, positive_class_ratio=0.7
      )
      np.bincount(y) == (300, 700), np.bincount(y)
  
file_path: mlxtend/mlxtend/data/tests/test_multiplexer.py
imports: import sys
  import numpy
  from mlxtend.data import make_multiplexer_dataset
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 3 for calling a global function with example usage: test_imbalance() without return types